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Storage Industry Overview
2.3 Input/Output (I/O) Protocol
The so-called I/O (Input/Output) means data input and output action, and Protocol is
used to define the common connection “standard” for input and output. The whole
storage system architecture can be mainly divided into two parts, one is the transfer
interface in between the computer server mainframe (Host) and RAID Controller end
(as in circle 1), another is the transfer interface at the in between the storage device
and the hard disc end (as in circle 2). Currently, the mainstream outer transfer
interface between the host and storage system is mainly based on SCSI and FC,
and the controller interface in between storage device and hard disc is mainly based
on ATA, SCSI. However, along with the launch of Serial ATA new interface into the
market, with its more spec advantages than original ATA, it is expected to replace the
original ATA market within three years, and its growth within five years is expected to
exceed and penetrate into SCSI market, it is expected to enter the higher level
enterprise server application market. Due to the higher cost of Fibre interface
product, it is used currently only in some large enterprises.
Storage core technology, RAID
Disk
•PCI
•PCI X 2.0
•PCI Express
•Fibre Channel
•SCSI
•Serial ATA
•ATA
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•FC to SCSI(FAS)
•FC to SATA/ATA (FAS)
•FC to FC (FAS)
•iSCSI to SATA (FAS)
•SCSI to SCSI (DAS)
•SCSI to ATA (DAS)
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2 1
Host-Bus
p6
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